Apparatus for corroding lead



.(Nov Model.) V 2Sl1eetsSheet 1 G. D. COLEMAN. APPARATUS FOR GORRODINGLEAD.

No. 481,004. Patented Aug 16, 1892.

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fieo i e ri an (No Model.) 2 Shets-Sheet 2. G. D. COLEMAN. APPARATUS FORUORR-ODING LEAD.

No. 481,004. Patented Aug. 16, 1892.

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NITED STATES 'ATENT OFFICE.

APPARATUS FOR CORRODING LEAD.

SPECIFICATION forming part of Letters Patent No. 481,004, dated August16, 1892. Application filed August 17, 1891. Serial No. 402,921. (Nomodel.)

To aZZ whom, it may concern:

Be it known that I, GEORGE D. COLEMAN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Apparatus for CorrodingLead; and I do hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, forminga part of this specification.

The present invention relates to certain improvements in tumblingapparatus for corroding metallic lead in a comminuted state to formoxides or other salts of lead, more particularly for use in themanufacture of white lead, the objects of the present improvement being,first, to provide an improved construction and arrangement of the partsof a leadcorrodiug apparatus, whereby a convenient and perfect controlis afforded of the water supply or flow by which the rise in temperature, due to chemical as well as frictional or mechanical action withinthe corroding-cylinder, is regulated and the particles of metallic leadkept clean and bright by the removal of corroded product as fast asformed, as well as the positive induction and eduction of the gasesemployed in the corroding operation; second, to provide an automaticfeeding attachment for replenishing the supply of comminuted lead withinthe corroding cylinder to compensate for the amount carried away in theform of a corroded product in the continued operation of the apparatus;third, to afford an improved construction of the inner periphery of therevolving corroding cylinder or drum, whereby the frictional wear due tothe rolling or shifting movement of the lead particles within the sameis confined to the top surface of the series of longitudinal ribs on theinner periphery of the corroding cylinder or drum. I attain such objectsby the construction and arrangement of parts illustrated in theaccompanying drawings, in which Figure 1 is a longitudinal sectionalelevation of a lead-corroding apparatus embodying my presentimprovements; Fig. 2, a transverse sectional elevation at line 00 as,Fig. 1; Fig. 3, a detached sectional elevation of the mechanism forimparting motion to the automatic feeding device for the comminutedlead; Fig. 4, an enlarged detail section of the automatic feeding deviceproper; Fig.5, an enlarged detail transverse section of the gas andwater pipes within the cylinder; Fig. 6, a detail section of a part ofthe wall of the cylinder, showing the relative arrangement of thelongitudinal ribs on the inner periphery of the same.

Similar numerals of reference indicate like parts in the differentviews.

Referring to the drawings, 1 represents the horizontally-arrangedcorroding cylinder or drum, of wood or metal, as desired, and providedwith axial trunnions by which it is journaled to rotate in the endstandards 2 of a suitable frame 3, continuous rotary motion beingimparted to the cylinder in any suitable and Well-known manner,preferably by a counter-shaft 4, supported in bearings in the standards2, pinions 6, and gears 7 and 8.

9 is a manhole at one or both ends of the cylinder for access to theinterior of the same and through which the supply of comminuted lead canbe introduced in the initial starting of the apparatus, the subsequentsupply being effected automatically and continuously by automaticfeeding mechanism, hereinafter more fully described. The inner peripheryof the cylinder or drum. 1 will be lined with any suitable uncorrodiblematerial, preferably sheet-brass, and provided with a series oflongitudinal ribs or bars 10, having an oblong square formation andarranged in close relation to each other, as illustrated in Fig. 6, soas to leave a space or cavity between adjacent ribs of a width aboutequal to the width of the top face of a rib or bar 10. This arrangementprovides narrow longitudinal cavities around the inner periphery thatfill with a body of the lead particles at their lower positions andholds the same to form a frictional surface, even with the top of theribs. In this manner wear upon the ribs is restricted to the top surfaceof the ribs alone, and in consequence the lifetime of the ribs isextended to a great length. The trunnions of the corroding-cylinder aremade hollow for the passage of the axial pipes, by which the flow ofwater and gases takes place through the corroding-chamber, leakage beingprevented at each cylinder-head around said pipes by means of thestufiing-boxes or glands 11. Said pipes, as illustrated in the drawings,consist of the induction and eduction non-rotary sections of water-pipe12 and 13, and the similar induction and eduction nonrotary sections ofgas or air pipe 14 and 15, that are arranged to surround the water-pipesections, as shown, the induction-pipe sections 12 and 14 being,respectively, perforated and slotted along their length within theinterior of the corroding-cylinder, so as to evenly distribute the waterand gas along the whole length of such cylinder, while the eductionsections of pipe 13 and 15 communicate with the interior of thecorroding-cylinder in the following manner: The air-eduction pipe 13 bymeans of a lateral opening 16 and the water-eduction pipe by means of anopenended downwardly-extending branch 17, that dips into the containedwater in the corroding cylinder, said branch-pipe being preferablyarranged in an oblique direction, so as to take water at a point removedfrom the end of the corroding'cylinder.

The difierent pipesections 12, 13, 14,15, and 17 are connected together,so as to brace and support each other, by means of a hollow Y- shapedplug 18, which affords a very convenient support for the inner ends ofthe diiferent pipe-sections, as clearly indicated in Fig. 1. The passageof the water induction and eduction pipes 12 and 13 through the ends oftherespective air induction and ed notion pipes 14 and 15 is eflfectedin a tight manner by means of glands or stuffing-boxes 19 and 20 in therespective couplings of the pipe-sections 12 and 13 with their inlet andoutlet branch pipes 21 and 22, through which the air or other gas isintroduced under pressure from a suitable accumulator or other sourceand discharged into a succeeding corroding-chamber or other escape, asdesired, such escape being controlled and regulated by a valve 23. Thewater eduction or outlet branch pipe is similarly provided with a valve24, so as to regulate the flow of water through the corrodingcylinder,and in consequence the degree of temperature therein, caused bymechanical as well as chemical action, the water inlet orinductionbranch 25 being connected to apump or other suitable source ofwater-pressure supply.

Suitable gages (not shown) may be employed to indicate the temperatureas well as the pressure prevailing within the corroding-cylinder.

The gaseous body employed in the corroding-cylinder will usually consistof atmospheric air, as aifording in a very cheap and convenient form thenecessary oxygen required in the formation of the lead suboxide orprotoxide. When, however, a lead hydrocarbonate alone or a mixturethereof with the sub or prot oxide is required, the gaseous supply tothe corroding-cylinder will consist of a mixture of atmospheric air andcarbonic-acid gas.

An automatic feeding mechanism, as follows, is provided for introducinga constant and limited supply of comminuted metallic lead to compensatefor the amount abstracted in the form of corroded lead. In this 26 is arotary cylinder receiving an intermittent rotary motion from the drivingcounter-shaft 4 of the apparatus or other suitable source of motionthrough the eccentric 27 on said shaft, eccentric-rod 28, rock-arm 29,carrying a pawl 30, that engages and actuates a ratchet-wheel 31, fixedon the hub of the cylinder 25, to effect the desired intermittentrotation of the same. The rock-arm 29 has pivotal movement on the hub ofthe cylinder 26, and the connection of the eccentric-rod 28 thereto isadjustable in a radial direction to or from the axis of the cylinder 26,so as to regulate the speed with which the same is rotated. Theperiphery of the cylinder 26 is formed with a number of pockets orrecesses 32, that take a supply of comminuted lead from the upperchamber of the casing 33 of such cylinder to carry it to the lowerchamber thereof.

In the construction shown the upper chamber is in connection with thesupply funnel or hopper 34, while the lower chamber is in communicationwith the air-inlet or induction-pipe section 14, into which the leaddrops to be conveyed by the spiral conveyer 35 forward into thecorroding-cylinder. The spiral conveyer 35 is on a sleeve surroundingthe water-induction pipe 12 and passes out through the gland orstuffing-box 19 and is provided with a belt-pulley 36, by which 1110-tion is imparted to the spiral conveyer from any suitable source.

37 is a gland or stuffing-box formation for preventing a leakage at thejoint between the conveyer-sleeve and the water-induction pipe.

38 is a straightway-valve immediately beneath the feeding-cylinder 26,for the purpose of closing the communication between the same and theinterior of the corroding-cylin der when it is desired to repair suchmechanism, or for any other required uses.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In a lead-corroding apparatus, the combination, with thehorizontally-arranged revolving cylinder, of a water-induction pipeextending in through the trunnion or axis of the cylinder, and awater-eduction pipe extending out through the trunnion or axis of suchcylinder and having its inner end extending downwardly from the centerof the cylinder, such pipes being adapted to maintain a flow of waterthrough the cylinder, for the purpose set forth.

2. In a lead-corroding apparatus, the combination, with thehorizontally-arranged revolving cylinder, of water and gas inductionpipes extending in through the trunnion or axis of the cylinder, and awater-eduction pipe extending out through the trunnion or IIO axis ofsuch cylinder and having its inner end extending downwardly from thecenter of the cylinder, such pipes being adapted to maintain a flow ofwater through the cylinder, for the purpose set forth.

3. In a lead-corroding apparatus, the combination, with thehorizontally-arranged revolving cylinder, of water and gas inductionpipes extending in through the trunnion or axis of the cylinder andwater and gas eduction pipes extending out through the trunnion or axisof the cylinder, the inner end of the water-eduction pipe being extendeddownwardly from the center of the cylinder, such pipes being adapted tomaintain a flow of water and gas through the cylinder, for the purposeset forth.

4. In a lead-corroding apparatus, the horizontally arranged revolvingcylinder provided with ribs on its inner periphery of an oblong squareform arranged a' distance apart, so as to form spaces or cavities of awidth nearly equal to that of the face of the ribs, as described, andfor the purpose set forth.

5. In a lead-corroding apparatus, the combination, with thehorizontally-arranged revolving cylinder, of water and gas inductionpipes extending in through the trunnion or axis of the cylinder andWater and gas eduction pipes extending out through the trunnion or axisof the cylinder, the downwardly-extending branch pipe 17, and a Y-shapedplug 18, connecting the inner ends of said pipes together, for thepurpose set forth.

6. In a lead-corroding apparatus, the combination, with thehorizontally-arranged re,- volving cylinder, of an induction pipe orpassage extending in through the axis or trunbination, with thehorizontally-arranged revolving cylinder, of an induction pipe orpassage extending in through the axis or trunnion of the cylinder, arotatable cylinder 26, having peripheral feed-pockets 32, a casinginclosing said cylinder and having communication with the supply-hopperand the axial induction-pipe of the main cylinder, and a means forimparting intermittent rotation to the feeding-cylinder, consisting ofthe ratchetwheel 31, pawl 30, arm 29, eccentric-rod 28, and eccentric27, for the purpose set forth.

8. In a lead-corroding apparatus, the combination, with thehorizontally-arranged revolving cylinder, of an induction pipe orpassage extending in through the axis or trunnion of the cylinder, aspiral conveyer arranged to rotate in said induction pipe or passage, arotatable cylinder 26, having peripheral pockets 32, and a casinginclosing said cylinder and having communication With the supply-hopper,and the axial inductionpipe of the main cylinder, for the purpose setforth.

In testimony whereof Witness my hand this 5th day of August, 1891.

GEORGE 1). COLEMAN.

. In presence of- ROBERT BURNS, KNOWLTON L. Arms.

